/*
 * Anything: A flexible and easy to use data structure that combines the 
 * characteristics of a list and a hashmap into one data structure.
 * 
 * Based on a paper by Peter Sommerlad and Marcel Rueedi on 
 * 'Do-it-yourself reflection' entered at EuroPLOP 1998.
 * 
 * This library was written completely from scratch and is based only 
 * in spirit on the original Java Anything implementation written by 
 * Andre Weinand/Marcel Rueedi in 1997/99 and enhanced by Stefan Tramm 
 * in 2006.
 * 
 * Copyright (c) 2008 Thomas Marti and others. All rights reserved.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package any.functor.impl.func;

import java.util.Iterator;
import java.util.Map.Entry;

import any.ImmutableAny;
import any.functor.interfaces.AnyIteratingFunction;
import any.functor.interfaces.Function;
import any.impl.util.MapEntry;
import any.impl.util.Utils;
import any.incubator.IterableConfig;
import any.incubator.IterableConfigCreator;

public class AsEntries<T> 
	extends BaseAnyFunction<T, Void, AsEntries<T>> 
	implements AnyIteratingFunction<Iterable<Entry<String, T>>> {

	protected Function<ImmutableAny, T> asFunc;

	@SuppressWarnings("unchecked")
	public Iterable<Entry<String, T>> apply(ImmutableAny from) {
		IterableConfig config = IterableConfigCreator.order(direction).select(predicate);
		final Iterable<? extends Entry<String, ? extends ImmutableAny>> entries = from.entries(config);

		if (asFunc == null) {
			return (Iterable)entries;
		} else {
			return Utils.wrapIterator(
				new Iterator<Entry<String, T>>() {
					final Iterator<? extends Entry<String, ? extends ImmutableAny>> it = entries.iterator();
					public boolean hasNext() {
						return it.hasNext();
					}
					public Entry<String, T> next() {
						Entry<String, ? extends ImmutableAny> entry = it.next();
						return MapEntry.createMapEntry(entry.getKey(), entry.getValue().give(asFunc));
					}
					public void remove() {
						it.remove();
					}
				}
			);
		}
	}
	
	@SuppressWarnings("unchecked")
	public <X> AsEntries<X> eachElement(Function<ImmutableAny, X> func) {
		return (AsEntries<X>)this;
	}

}
